Clear One AP400 User manual

AP400 Audio Conferencing System
Installation & Operation Manual

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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
© 2002 ClearOne Communications, Inc. All
rights reserved. No part of this document may
be reproduced in any form or by any means
without written permission from ClearOne
Communications, Inc. Printed in the United
States of America. ClearOne Communications,
Inc. reserves specific privileges. Information in
this document is subject to change without
notice.
AP400 Installation and
Operation Manual
ClearOne Part No. 800-150-001
July 2002 (Rev. 5.0)

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ClearOne Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
AP400 Installation and Operation Manual
Table of Contents
CHAPTER 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . .1
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Professional Services Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Sales and Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
ClearOne Communications EuMEA GmbH . . . . . . . . . . . . . . . . . . . .3
Product registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Product returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Controls and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Rear panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
G-Link Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
G-Link bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
CHAPTER 2: Installation . . . . . . . . . . . . . . . . . . . . . . . . . .9
Equipment Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Telephone line requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Auxiliary equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Equipment placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Connecting the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Networking Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
G-Link connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Device IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Mixer mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
LCD Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Menu trees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
System parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

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Input parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Output parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Routing parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Meter parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
CHAPTER 3: AP-Ware Software . . . . . . . . . . . . . . . . . . . .31
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Installing AP-Ware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
To install AP-Ware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
CHAPTER 4: Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Controlling the volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Telco Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
To make and disconnect a call . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Other telco options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Custom control through DB-25 port . . . . . . . . . . . . . . . . . . . . . . . .35
Touch panel control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Appendix B: Warranty and Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Appendix C: Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Appendix D: Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Appendix E: Serial Port Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Appendix F: Worksheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Congratulations on purchasing the Audio Perfect
®
400, an advanced eight-by-eight
digital matrix mixer with Gentner
®
Distributed Echo Cancellation
®
, audio processing,
and a single-line telephone hybrid. It uses six user-definable presets to quickly adapt
to a variety of teleconferencing and sound reinforcement applications such as
distance learning, teletraining, telemedicine, courtrooms, conference rooms,
boardrooms, hotels, and houses of worship.
All of the AP400’s functions are programmed in AP-Ware™, an all-new
configuration software. The result is quicker setup, with fewer hassles and more
control.
In its most simple form, the AP400 is a mic mixing matrix. As such, all mic
mixing parameters can be customized and any input or combination of inputs can
be routed to any output or combination of outputs. This allows great flexibility in
accommodating a variety of applications and requirements.
The AP400 features numerous functions which greatly enhance its
performance and flexibility. For example, it can gate mics on and off when the
sound within a mic’s acceptance pattern reaches a certain level.
The AP400 monitors each mic independently, observing ambient levels and
making decisions based on each mic’s environment. Thus, the input for a mic
located in a highly reverberant part of a conference room is gated, mixed, and
processed to compensate for the changes in that area and to reduce echo and
noise. This improves audio quality and decreases the possibility of feedback.
The AP400 facilitates local and remote PC setup and diagnostics, logic
outputs, and automatic gated mic operation. Mic inputs can be individually
customized to gate on and off as you want, while automatic gain control keeps the
overall sound level consistent.
Adjustments in routing, level, and other functions can be made through
presets activated through a rear-panel closure or an RS-232 serial interface.
Network-based interconnectivity allows up to eight AP400/AP800 units to be
connected and controlled as a single unit.
CHAPTER 1: Introduction
Product Overview

Introduction ~ Product Overview
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Features
• Distributed Echo Cancellation technology; each microphone has its own echo
canceller for a total of eight echo cancellers per unit
• Easy-to-use AP-Ware software for quick configuration of all functions
• 100 percent digital signal processing (DSP) ensures crystal-clear audio with
the deepest, most reliable hybrid null
• Simultaneous direct connection to several video codecs
• 8 x 8 matrix mixer
• Internal submixing bus for mixing and level control in sound reinforcement
systems
• Eight line output channels expandable with additional AP400 units; any of
the eight input channels can be mixed to any of the eight outputs on a given
unit; all output levels are adjustable and can be instantly muted
• Four-channel automatic microphone mixer with four line inputs (expandable)
• All automatic microphone functions and operating modes operate across
expanded units
• Input gain, audio processing, equalization, muting, and automatic mixer
• Expandable using a high-speed digital network bus; a total of eight AP400s
can be interconnected
• All G-Linked devices can be accessed, controlled, and programmed via a
single RS-232 connection
• Program, operate and perform diagnostics from the front panel, a
connected PC (direct or via modem) or other type of serial remote-control
device
• Six programmable presets for instant configuration changes
• Lockout front-panel access for security
• Built-in telephone interface with touch-tone dialing, echo cancellation,
continual phone line adaptation, receive reduction, and analog phone line
compatibility
• 5W speaker amp output

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Introduction ~ Professional Services Group
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
If you need any additional information on how to install, set up, or operate your
system, please contact us at one of the locations listed below. We welcome and
encourage your comments so we can continue to improve our products and serve
your needs.
ClearOne Communications ~ 1825 Research Way ~ Salt Lake City, UT 84119
Technical Support
Telephone: [phone] (USA) or 1.801.974.3760
Fax: [phone]
E-mail: [email protected]
Web site: www.clearone.com
Sales and Customer Service
Telephone: [phone] (USA) or 1.801.975.7200
Fax: [phone] (USA) or 1.801.977.0087
E-mail: [email protected]
ClearOne Communications EuMEA GmbH
Leonhardstr. 16-18, D-90443 Nuremberg, Germany
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Product registration
Please register your AP400 online by visiting ClearOne Technical Support at
www.clearone.com. When your product is properly registered, ClearOne is better
able to serve you should you require technical assistance. Registration information is
also used to notify you of upgrades and new product information.
Product returns
All product returns require a return authorization (RA) number. Please contact
ClearOne Technical Support before attempting to return your AP400 unit.
Professional Services Group

Introduction ~ Unpacking
Ensure that the equipment shown below was received with your shipment.
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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Unpacking
www.gentner.com AudioProducts
AP400 Audio Conferencing System
GentnerCorporation ~ 1825 Research Way,Salt Lake City, UT 84119 ~ tel [phone] ~ fax [phone]
Installation& Operation Manual
Figure 1.1. Equipment
Controls and Connections
ClearOne is not responsible
for product damage
incurred during shipment.
You must make claims directly with
the carrier. Inspect your shipment
carefully for obvious signs of
damage. If the shipment appears to
be damaged, retain the original
boxes and packing material for
inspection by the carrier. Contact
your carrier immediately.
!
Front panel
A. LCD. The two-line, 16-character-per-line LCD display is used for AP400
setup and level adjustments in conjunction with the four associated front-
panel buttons [B]. Functions that can be accessed via the front-panel LCD
include setup, programming, troubleshooting, and numeric audio level and
gain readouts.
B. Enter/▲▼/ESC. These buttons are used to navigate the AP400’s menu
system.
ABC E F G
DH
Figure 1.2. Front panel controls
AP-Ware software provides
complete configuration
capabilities for the AP400.
Please refer to the AP-Ware help file
for more information.
✍

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Introduction ~ Controls and Connections
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
C. LED Meter. The LED bar meter is displays the audio level of any selected
input or output on the AP400, as well as displaying echo return loss (ERL)
and echo return loss enhancement (ERLE) for mic channels 1–4.
D. Meter. The Meter button takes you directly to the Meter branch of the
AP400’s LCD programming tree.
E. System, Inputs, Outputs, Routing. These buttons provide direct access to
the corresponding sections in the LCD menu.
F. Mic On LED. These LEDs indicate microphone gate status.
G. On. The On button connects and adapts the AP400 to the telephone line.
Pressing and holding the On button for more than two seconds while the
AP400 is active readapts the unit.
H. Off. The Off button disconnects the AP400 from the telephone line and
mutes all audio to and from the telephone line.
Rear panel
A. Power. This power module accommodates power ranging from
100–240VAC, 50/60Hz, 30W. No switching is required.
B. Inputs A–D. These connectors are used with line-level inputs. Inputs can
include video codecs, AP10 Telephone Interfaces, VCRs, or CD players, or
other audio sources. These inputs can be mixed in any combination with the
gated inputs to any of the eight outputs. Nominal input is 0dBu. Mix level
can be easily set for each non-gated input.
C. Outputs A–D, 1–4. These connectors allows eight line-level outputs to be
connected to the unit. Outputs can include video codecs, AP800s, AP10
Telephone Interfaces, and VCRs. These outputs can be configured to contain
any combination of gated and non-gated inputs. The nominal output level is
0dBm.
AB
C
DE
FG
HI
The front panel buttons are
also used to enter the front
panel passcode. See Lock
Panel (page 17) for more details.
The front panel passcode can also
be created in AP-Ware. Refer to the
AP-Ware help file for more
information.
✍
For electrical
specifications, see
Specifications, page 37.
✍
Figure 1.3. AP400 rear panel connectors

Introduction ~ G-Link Networking
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D. Mics 1–4. Up to four mic/line-level inputs (selectable) can be connected
using the three-terminal Phoenix connector(s).
E. G-Link In, Out. These RJ-45 connectors are part of the AP400’s high-
speed digital bus network, which passes audio between units.
F. RS-232. This female DB-9 serial port is for connection between the AP400
and a PC, modem, or other custom remote control. For serial
communications protocol, see Appendix E, page 43.
G. Control/Status. This female DB-25 connector is used to interface parallel
control to the AP400. Most of the pins on this connector can be
programmed to perform any function via a contact closure to ground. For
instructions on how to program the control and status pins, see page 61 or
the AP-Ware help file. These pins go low when active. The six presets can be
activated at any time via these connectors. For pinouts, including a
description of the default settings, see Appendix C, page 42.
H. Speaker. One five watt, 4-16Ωspeaker can be directly connected to the
AP400, eliminating the need for a power amplifier.
I. Telco Line. Connects to your telephone line source.
Telco Set. Connects to your telephone handset.
Digital technology can provide a distinct advantage in designing and controlling
teleconferencing systems. The ability to network with additional AP units (for a
maximum of 64 mic inputs) makes the Audio Perfect systems ideal for room
combining applications or larger applications which require more microphone inputs.
The G-Link gives you the ability to interconnect the AP400 with other Audio
Perfect units (additional AP400s, AP10s, and AP800s). The maximum distance
between connected ClearOne units is 20 feet. ClearOne Communications recommends
that category five twisted-pair (10Base) cable be used.
G-Link bus
This digital bus is on every Audio Perfect product. It is a mix-minus bus which
allows audio to be routed to any destination on the G-Link network. The AP400 has
four digital buses: X-bus, Y-bus, Z-bus and G-Link EC Reference bus.
G-Link Network
Do not attempt to create a
system using more than
64 microphones. You can
combine up to eight AP800s or
AP400s.
✍

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Introduction ~ G-Link Networking
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
X-bus
This mix-minus bus is defined as the master microphone mix, and it supports NOM
(see page 26). All gated microphones are default routed to this bus.
Y-bus
This mix-minus bus is defined as the line input master mix. All line-level audio inputs
such as video codecs, AP800s, AP10 Telephone Interfaces, VCRs, etc., are default
routed to this bus. Y-bus does not support NOM.
Z-bus
This mix-minus bus is a user-defined auxiliary mix bus. Z-bus does not support
NOM.
G-Link EC Reference bus
This bus provides a system-wide echo canceller reference signal. It allows the
reference signal to be passed to additional G-Linked mic channels and their
associated echo cancellers. Typically, one output on one unit will be passed along the
G-Link EC Reference bus.
Control bus
The control bus is an independent channel from the G-Link’s audio channel; it uses a
different pair of wires on the same cable. This allows control information to pass
even if the units are not using the audio link. The AP400 supports the full set of
commands through the control bus.

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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
CHAPTER 2: Installation
Power requirements
The AP400 will accommodate an AC voltage-input of 100–240VAC, 50/60Hz, 30W.
Telephone line requirements
The AP400’s telephone interface operates on a standard analog telephone line and
connects with a standard RJ-11C modular jack. If you do not have an RJ-11C jack
where you want to install the AP400, contact your telephone company for
installation.
Auxiliary equipment
Any auxiliary equipment to be used with the AP800 (i.e., AP400, AP10 Telephone
Interface, AP IR Remote Control, desktop kit, microphones, speakers, recording
equipment, etc.) should be available at time of installation.
Equipment placement
The AP800 is designed for mounting in a 19" equipment rack. Do not block any of
the unit’s ventilation holes. With a desktop kit, the unit can be adapted for tabletop
placement.
Environmental requirements
The AP800 can be safely operated in a room with varying temperatures between 32°
and 110°F (0-43°C).
Equipment Requirements

Installation ~ Hardware Setup
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The AP400 is designed for easy installation and setup. All connections are made
through rear-panel connectors. This chapter provides instructions on installing the
units and making initial connections, creating a G-Link network, assigning device ID
numbers, selecting the mixer mode, and using the LCD menu.
The diagram below illustrates the typical connections that are made for a
single-unit AP400 system. The default routing settings in AP-Ware allow the
AP400 to work out of the box for this type of installation.
Figure 2.1. AP400 installation diagram
Hardware Setup

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Installation ~ Hardware Setup
Connecting the unit
To connect the AP400
1. Place the unit in a standard 19-inch rack and attach it securely.
2. Connect the telephone line from the wall jack to the RJ-11C Line jack [I].
3. Plug the telephone set into the RJ-11C Set jack [I].
4. If you are using a custom controller for control and status, connect it to the
Control/Status port [G].
If you are using an external RS-232 controller or the AP IR remote,
connect it to the RS-232 port [F].
5. Wire the inputs and outputs to the AP400 using the provided three-terminal
Phoenix push-on connectors. These connectors are designed for easy wiring;
simply insert the desired wire into the appropriate connector opening and
tighten down the top screw.
•Mic 1–4 [D] Mic or line level inputs
•Inputs A–D [B] Line level inputs only
•Outputs A–D, 1–4 [C] Line level outputs
When connecting, use the screened legend on the back of the unit;
overlapping from one channel to another can cause improper operation.
6. Connect the speaker wire to the + (red) and –(black) binding post
connectors. A 4–16Ωspeaker can be directly connected to the AP400,
eliminating the need for an external power amplifier.
7. Plug in the AP400 to complete the installation. The power output [A] will
operate at any level between 100–240VAC and 50–60Hz.
If you are installing only one AP400 and are not connecting it to any other AP units,
you have completed the hardware installation.
AB
C
DE
FG
HI
Figure 2.2. Rear panel connections
The three terminals in
the Phoenix connector
correspond with the rear-
panel audio contacts (from left to
right): + (positive), – (negative),
and
 (ground).
✍
Figure 2.3. Phoenix push-on connector

Installation ~ Networking Units
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G-Link connections
Using the G-Link connectors, you can connect up to eight AP800/400s and 16 AP10
units, where the total number of microphone inputs does not exceed 64. Make
connections between units in daisy-chain fashion using the short RJ-45 jumper
(provided). If your units are further apart (maximum distance 20 feet), use category-
five twisted-pair cable (10 BaseT).
For a single-unit system, no connection is required in either G-Link In or
G-Link Out connectors.
To create a G-Link network
1. Insert a G-Link terminator (provided) in the G-Link In connector of the first
unit in the network.
2. Connect the RJ-45 jumper cable (or Cat. 5 twisted-pair cable) to the G-Link
Out connector of the first unit and to the G-Link In connector of the second
unit. Continue connecting units in the same fashion.
3. Plug the G-Link terminator in the G-Link Out connector on the last unit to
complete the network connections.
A G-Link network supports
connection of a maximum
of any combination of 8
AP400s and AP800s. It also
supports up to 16 additional AP10s,
for a maximum of 24 telephone
lines.
✍
Figure 2.4. G-Link Network Connections
Networking Units

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Installation ~ Networking Units
Device IDs
Once your physical G-Link network is established (and if you have more than one AP
unit at a site), you need to specify unique device ID numbers for each AP400 on the
network. As shipped from the factory, all AP400 units default as device ID “0”. Set
device ID numbers for each unit at your site by manipulating the front-panel LCD.
To set the device ID
1. Press the System button, then scroll to Device ID.
2. Press Enter, then scroll through the eight (0–7) options.
3. Press Enter to select the appropriate device ID.
Repeat this process for each
AP product on the G-Link network.
If the same Device ID is assigned to more than one unit of the same type on
the G-Link network, Meter LED “+12”will flash red and Meter LED “0”, “-4”,
“-30”, and Mic 4 will flash green on the affected units. To correct the problem,
change the device ID on one of the units.
Device types
Device IDs are automatically assigned a device type. AP400s are always device
type “3”(AP800 device types are “1”, AP10 device types are “2.”). The device
ID # selected is added to the device type “3”to generate the unique address for
that unit. For example, the first AP400 unit in your G-Link network would be
identified as “30”, “3”being the Device Type, and “0”being the Device ID.
Mixer mode
Once your physical G-Link network is established and unique G-Link device ID
numbers for each AP400 on the network are established, the mixer mode must be
set. There are three mixer-mode settings: master-single (default), master-linked, and
slave.
•Master-single must be used when only one AP400 is used in a system.
•Master-linked denotes the master AP400 unit when more than one AP400 is
on the network; only one AP400 can be designated as master-linked when
multiple AP400s are used in a system.
•Slave is used for all networked AP400s that are not designated as master-
linked or master-single. If two AP400s are part of the same system, set one
with the master-linked parameter. Set the other with the slave parameter.

Installation ~ Networking Units
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A system is defined as one or more AP units that communicate to perform
mixing functions. A system can consist of one unit in master-single mode or
several units that work together with one master-linked unit and multiple slave
units. Systems can be G-Linked together for easy reconfiguration, as shown in
Figure 2.5. The physical location on the G-Link network determines which system
individual units belong to. In Figure 2.5, for example, AP400 device 4 has been
designated as master-linked. The units located below this unit on the G-Link
network constitute System 3, while units above it belong to different systems. The
entire network could be easily reconfigured into one system by changing the mixer
mode on Devices 3 and 4 to slave units which would then refer to the only master-
linked unit on the system: AP400 device 0.
To set mixer mode
1. Press the System button. Scroll through the menu until you see Mixer Mode.
2. Press Enter, then scroll through the three options.
3. Press Enter at the appropriate option to select it.
4. Repeat this process for all AP units in the G-Link network.
EC reference
When multiple AP400 units are linked together and will use only one output channel
to drive the speaker system, this output must be defined as the acoustic source which
will be used by all of the linked AP400s. In other words, the output which the
master unit will use as the EC reference must be identified to the slave units via the
G-Link. See page 28 for details on echo cancellation setup for multiple units.
Errors
If the units are not connected correctly, you might experience a synchronization
error. Meter LED “+12”will flash red and Meter LEDs “0”, “-4”, and “-30”flash
green on affected slave units. The error is the result of one of two problems:
incorrect master/slave configuration or a broken G-Link connection.
If it is a master/slave configuration error, LEDs will flash on a unit that is
designated as a slave unit but does not have a master unit. To correct the problem,
make certain that Mixer Mode for the master unit is set to Master-Linked and not
to Master-Single.
If the error is in the G-Link connection, LEDs flash on the units that are not
physically connected to master unit. To correct the problem, check for broken
connections and reconnect the G-Links.
Figure 2.5. Multiple AP systems

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Installation ~ LCD Programming
LCD Programming
For most installations, the default settings in the AP400 do not need to be changed;
the system can be used as soon as power is applied. However, if you need to
customize any settings, such as telephone connection options or unique routing
requirements, you can do so through the front panel user interface or with AP-Ware
software.
The front panel includes a 2x16 character LCD, menu buttons, level LED bar
meter and gate LED indicators.
When power is applied to the AP400, all LEDs light and the LCD panel reads
INITIALIZING. If initialization is completed without any errors, a title screen
appears, showing the product name (top line) and the version number (bottom
line). The title screen remains on display until you initiate some action that writes
information to the LCD panel or the AP400 detects and displays an error. (If an
error is displayed, contact our Technical Services Group.)
Menu trees
Five menu trees (menu categories) comprise all of the AP400 options you can control
through the front panel: System, Inputs, Outputs, Routing, and Meter. You enter each
of the trees, or move from one tree to another, by pressing the corresponding button
(right).
The menu trees are structured in levels, such that the first level (top of the
tree) branches into multiple subcategories (see Figure 2.7, next page). These
branches typically end when an adjustable parameter or viewable value is reached.
Navigating the menu items
Use the ▲and ▼buttons to scroll through the menu items at a particular level.
When you reach the last menu item, the display scrolls back to the beginning of the
list, and vice-versa. If you hold down an ▲/▼button, the scrolling speed increases.
To descend a menu level (go deeper into the tree), press Enter. To ascend a
menu level (go back toward the top of the tree), press Esc.
Switching from one main menu category to another
To switch between main menu categories, press the System, Routing, Outputs, Inputs,
or Meter buttons. If the menu tree is left inactive for a period of time (see Timeout,
page 22), the LCD reverts to the title screen.
Figure 2.6. Front panel buttons
Pressing ESC at the top of
the menu tree has no
effect.
✍

Installation ~ LCD Programming
16
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ClearOne
Figure 2.7. LCD menu tree
Adjusting a value
To adjust a parameter, first verify that it is flashing. If the parameter is not flashing,
it cannot be adjusted. If the parameter is flashing, adjust the value with the ▲and
▼buttons. As the value is adjusted, the parameter is updated immediately. For
example, if you adjust input gain, you should be able to hear the difference as it
changes. To store the new value, press Enter. To discard the change and revert back
to the old value, press Esc. If you press a menu category button while a parameter is
being adjusted, it is the same as pressing the Esc key.
In general, while adjusting parameters, numerical values do not wrap around
when the end is reached. However, parameters that toggle between two values (or
are a list of values) will wrap around. When adjusting a parameter and a ▲/▼
button is held, after 2 seconds the parameter will scroll through its values at a
faster rate.